Crystallization behavior of plasma-sprayed lanthanide magnesium hexaaluminate coatings
Crystallization behavior of plasma-sprayed lanthanide magnesium hexaaluminate coatings
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DOI：
10.1007/s12613-014-1034-2
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Liang-Liang Huang-Liang;H. Meng;Jing-kun Tang
中科院分区：
文献类型：
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作者：
Liang-Liang Huang-Liang;H. Meng;Jing-kun Tang
采用常压等离子喷涂技术制备了LaMgAl 11 O 19热障涂层。研究了LaMgAl_（11）O_（19）粉体的合成机理和涂层的晶化行为。结果表明，等离子喷涂涂层中含有非晶相，LaMgAl 11 O 19粉末在喷涂过程中部分分解为Al2 O3、LaAlO3和MgAl2 O4。非晶相在约1174.9°C的温度下再结晶，在该温度下分解的Al2O3、LaAlO3和MgAl2O4再次反应。等离子喷涂层中LaMgAl 11O 19的再合成温度低于原始粉末中LaMgAl 11O 19的再合成温度。LaMgAl11O19粉体的合成机理可以概括为：在整个反应的第一部分，La2O3与Al2O3在约900°C反应生成LaAlO3，然后LaAlO3进一步与Al2O3和MgAl2O4在约1200°C反应生成LaMgAl11O19。
LaMgAl11O19thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of LaMgAl11O19powders were researched. The results showed that the plasma-sprayed coatings contained some amorphous phase, and LaMgAl11O19powders were partially decomposed into Al2O3, LaAlO3, and MgAl2O4in the plasma spraying process. The amorphous phase was recrystallized at a temperature of approximately 1174.9°C, at which level the decomposed Al2O3, LaAlO3, and MgAl2O4reacted again. The resynthesis temperature of LaMgAl11O19in the plasma-sprayed coatings was lower than that of LaMgAl11O19in the original raw powders. The synthesis mechanism of LaMgAl11O19powders can be summarized as follows: during the first part of the overall reaction, La2O3reacts with Al2O3to form LaAlO3at approximately 900°C, and then LaAlO3further reacts with Al2O3and MgAl2O4to produce LaMgAl11O19at approximately 1200°C.